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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A080039 a(n) = floor((1+sqrt(2))^n).

Table of values

n a(n)
0 1
1 2
2 5
3 14
4 33
5 82
6 197
7 478
8 1153
9 2786
10 6725
11 16238
12 39201
13 94642
14 228485
15 551614
16 1331713
17 3215042
18 7761797
19 18738638
20 45239073
21 109216786
22 263672645
23 636562078
24 1536796801
25 3710155682
26 8957108165
27 21624372014
28 52205852193

List of values

[1, 2, 5, 14, 33, 82, 197, 478, 1153, 2786, 6725, 16238, 39201, 94642, 228485, 551614, 1331713, 3215042, 7761797, 18738638, 45239073, 109216786, 263672645, 636562078, 1536796801, 3710155682, 8957108165, 21624372014, 52205852193]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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